meta-digi: improve mkproject script

Some minor enhancements to mkproject script:

* Add 'conf-notes' files with DEY specific information. This is shown
  when you create the project or when you reload the environment in an
  already created project.

* Create a 'dey-setup-environment' script in the project's folder that
  allows to reload the environment in a new terminal.

* Remove the PATH variable tweaking. This was needed in older versions
  of Yocto, where the PATH kept growing each time you reloaded the
  environment, but it has been fixed in poky, so there is no need to do
  the same in our mkproject script.

https://jira.digi.com/browse/DEL-1150

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

sdk/config/ccardimx28js/conf-notes.txt

@@ -0,0 +1,11 @@
+Digi Embedded Yocto provides two target images:
+
+  * dey-image-minimal: command line busybox-based image
+
+    This image does not support the X11 window system so in order to build
+    it you need to add the following line to the project's conf/local.conf:
+
+    DISTRO_FEATURES_remove = "x11"
+
+  * dey-image-graphical: graphical X11-based image with SATO theme
+

sdk/config/ccimx51js/conf-notes.txt

@@ -0,0 +1,11 @@
+Digi Embedded Yocto provides two target images:
+
+  * dey-image-minimal: command line busybox-based image
+
+    This image does not support the X11 window system so in order to build
+    it you need to add the following line to the project's conf/local.conf:
+
+    DISTRO_FEATURES_remove = "x11"
+
+  * dey-image-graphical: graphical X11-based image with SATO theme
+

sdk/config/ccimx53js/conf-notes.txt

@@ -0,0 +1,11 @@
+Digi Embedded Yocto provides two target images:
+
+  * dey-image-minimal: command line busybox-based image
+
+    This image does not support the X11 window system so in order to build
+    it you need to add the following line to the project's conf/local.conf:
+
+    DISTRO_FEATURES_remove = "x11"
+
+  * dey-image-graphical: graphical X11-based image with SATO theme
+

sdk/config/ccimx6adpt/conf-notes.txt

@@ -0,0 +1,11 @@
+Digi Embedded Yocto provides two target images:
+
+  * dey-image-minimal: command line busybox-based image
+
+    This image does not support the X11 window system so in order to build
+    it you need to add the following line to the project's conf/local.conf:
+
+    DISTRO_FEATURES_remove = "x11"
+
+  * dey-image-graphical: graphical X11-based image with SATO theme
+

sdk/config/ccimx6sbc/conf-notes.txt

@@ -0,0 +1,11 @@
+Digi Embedded Yocto provides two target images:
+
+  * dey-image-minimal: command line busybox-based image
+
+    This image does not support the X11 window system so in order to build
+    it you need to add the following line to the project's conf/local.conf:
+
+    DISTRO_FEATURES_remove = "x11"
+
+  * dey-image-graphical: graphical X11-based image with SATO theme
+

sdk/mkproject.sh

@@ -30,6 +30,16 @@ MKP_CONFIGPATH="${MKP_SCRIPTPATH}/sources/meta-digi/sdk/config"
 # Blacklist platforms (not officially supported in a DEY release)
 MKP_BLACKLIST_PLATFORMS=""
 
+MKP_SETUP_ENVIRONMENT='#!/bin/bash
+
+if [ "${BASH_SOURCE}" = "${0}" ]; then
+	printf "\\n[ERROR]: This script needs to be sourced\\n\\n"
+else
+	cd $(dirname ${BASH_SOURCE})
+	. %s/sources/poky/oe-init-build-env .
+fi
+'
+
 ## Local functions
 usage() {
 	cat <<EOF
@@ -81,17 +91,18 @@ do_mkproject() {
 	source ${MKP_SCRIPTPATH}/sources/poky/oe-init-build-env .
 	unset TEMPLATECONF
 
-	# Remove possible duplicated entries in PATH (due to re-sourcing the script)
+	# New project
-	export PATH=$(printf ${PATH} | awk -v RS=: '{if (!arr[$0]++) {printf("%s%s", !ln++ ? "" : ":", $0) }}')
-
-	# Customize project if just created
 	if [ -z "${MKP_OLD_PROJECT}" ]; then
+		# Customize project
 		chmod 644 ${MKP_PROJECTPATH}/conf/bblayers.conf ${MKP_PROJECTPATH}/conf/local.conf
 		sed -i  -e "s,##DIGIBASE##,${MKP_SCRIPTPATH}/sources,g" ${MKP_PROJECTPATH}/conf/bblayers.conf
 		if [ -n "${MKP_VARIANT+x}" ]; then
 			sed -i -e "/^MACHINE_VARIANT =/cMACHINE_VARIANT = \"${MKP_VARIANT}\"" \
 				${MKP_PROJECTPATH}/conf/local.conf
 		fi
+		# Create dey-setup-environment script
+		printf "${MKP_SETUP_ENVIRONMENT}" "${MKP_SCRIPTPATH}" > ${MKP_PROJECTPATH}/dey-setup-environment
+		chmod +x ${MKP_PROJECTPATH}/dey-setup-environment
 	fi
 }
 
@@ -137,6 +148,16 @@ else
 fi
 
 # clean-up all variables (so the script can be re-sourced)
-unset MKP_AVAILABLE_PLATFORMS MKP_BLACKLIST_PLATFORMS MKP_GREEN MKP_LIST_PLATFORMS \
+unset MKP_AVAILABLE_PLATFORMS \
-      MKP_NONE MKP_OLD_PROJECT MKP_PLATFORM MKP_PROJECTPATH MKP_RED MKP_SCRIPTNAME \
+      MKP_BLACKLIST_PLATFORMS \
-      MKP_SCRIPTPATH MKP_VARIANT
+      MKP_GREEN \
+      MKP_LIST_PLATFORMS \
+      MKP_NONE \
+      MKP_OLD_PROJECT \
+      MKP_PLATFORM \
+      MKP_PROJECTPATH \
+      MKP_RED \
+      MKP_SCRIPTNAME \
+      MKP_SCRIPTPATH \
+      MKP_SETUP_ENVIRONMENT \
+      MKP_VARIANT