builddeb: rename --release option to --codename

Debian and Ubuntu releases have both codenames and traditional version numbers.
An entire "branch" of releases is referred to by its codename, and version
numbers (e.g. 8.2, 14.04.3) are used to address individual releases.

Since we use codenames for building .deb packages, let's call the option and
the variable appropriately.

Makefile

@@ -162,7 +162,7 b' osx:'
 
 deb:
 	mkdir -p packages/debian-unknown
-	contrib/builddeb --release unknown
+	contrib/builddeb --codename unknown
 
 docker-debian-jessie:
 	mkdir -p packages/debian-jessie

contrib/builddeb

@@ -8,12 +8,12 b''
 
 BUILD=1
 CLEANUP=1
-DEBVERSION=jessie
+CODENAME=jessie
 while [ "$1" ]; do
     case "$1" in
-    --release )
+    --codename )
         shift
-        DEBVERSION="$1"
+        CODENAME="$1"
         shift
         ;;
     --cleanup )
@@ -82,7 +82,7 b' if [ "$BUILD" ]; then'
 fi
 if [ "$CLEANUP" ] ; then
     echo
-    OUTPUTDIR=${OUTPUTDIR:=packages/debian-$DEBVERSION}
+    OUTPUTDIR=${OUTPUTDIR:=packages/debian-$CODENAME}
     find ../mercurial*.deb ../mercurial_*.build ../mercurial_*.changes \
           -type f -newer $control -print0 | \
       xargs -Inarf -0 mv narf "$OUTPUTDIR"

contrib/dockerdeb

@@ -8,7 +8,7 b' export ROOTDIR=$(cd $BUILDDIR/..; pwd)'
 
 checkdocker
 
-DEBPLATFORM="$1"
+CODENAME="$1"
 PLATFORM="debian-$1"
 shift # extra params are passed to build process
 
@@ -26,8 +26,8 b' if [ $(uname) = "Darwin" ] ; then'
             sh -c "cd /mnt/$dn && make clean && make local"
 fi
 $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
-  sh -c "cd /mnt/$dn && DEB_BUILD_OPTIONS='${DEB_BUILD_OPTIONS:=}' contrib/builddeb --build --release $DEBPLATFORM"
-contrib/builddeb --cleanup --release $DEBPLATFORM
+  sh -c "cd /mnt/$dn && DEB_BUILD_OPTIONS='${DEB_BUILD_OPTIONS:=}' contrib/builddeb --build --codename $CODENAME"
+contrib/builddeb --cleanup --codename $CODENAME
 if [ $(uname) = "Darwin" ] ; then
     $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
             sh -c "cd /mnt/$dn && make clean"