Update aid for backporting commits:

+ Change usage from comment to here document displayed as a hint
+ Allow to process multiple patches in bulk

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

misc/patch-update-for-r14-1-x

@@ -6,28 +6,38 @@
 # This script is intented to reduce/eliminate those conflicts by undoing the
 # API changes done in master.
 #
-# Usage:
-# 1. save the changes of the commit to backport to a file
-#    git format-patch -1 <commit hash> -o <output_folder>
-# 2. run this script on the saved file
-#    ./patch-update-for-r14-1-x <output_folder>/<patch_filename>
-# 3. apply changes to r14.1.x branch
-#    git am <output_folder>/<patch_filename>
-# 4. edit commit message to add cherry pick note under signed off clause
-#    git commit --amend --no-edit -S
-#    and add:
-#        (cherry picked from commit hash>)
+if [ -z "$1" ]; then
+  cat <<USAGE
+Preparing patches for backporting from master to r14.1.x branch.
+Usage:
 
+1. save the changes of the commit to backport to a file
+   git format-patch -1 <commit hash> -o <output_folder>
+
+2. run this script on the saved file
+   $(basename "$0") <output_folder>/<patch_filename> [...]
+
+3. apply changes to r14.1.x branch
+   git am <output_folder>/<patch_filename>
+
+4. edit commit message to add cherry pick note under signed off clause
+   git commit --amend --no-edit -S
+   and add:
+       (cherry picked from commit hash>)
+
+USAGE
+  exit 1
+fi
 
 # TDEUniqueApplication --> KUniqueApplication
-sed -i "$1" \
+sed -i "$@" \
     -e "s|TDEUniqueApplication|KUniqueApplication|g" \
     -e "s|\btdeuniqueapp|kuniqueapp|g" \
     -e "s|\btdeunique_|kunique_|g" \
     -e "s|TDEUNIQUEAPP|KUNIQUEAPP|g" \
 
 # TDEAppDCOPInterface --> KAppDCOPInterface
-sed -i "$1" \
+sed -i "$@" \
     -e "s|TDEAppDCOPInterface|KAppDCOPInterface|g" \
     -e "s|tdeappdcopinterface|kappdcopiface|g" \
     -e "s|tdeappdcopiface|kappdcopiface|g" \
@@ -35,5 +45,5 @@ sed -i "$1" \
     -e "s|TDEAPPDCOP_INTERFACE_H|KAPPDCOP_INTERFACE_H|g"
 
 # tdeprocess --> kprocess
-sed -i "$1" \
+sed -i "$@" \
     -e "s|tdeprocess|kprocess|g"