fix usage/help/man bugs

- the definition of $PROGRAM as used in $USAGE strings defined in each
   script has been broken for a long time, being simply "lb" when it needs
   to be "lb COMMAND".
 - `config` changed $PROGRAM to "lb config" thus its output was correct in
   this regard unlike everything else, but with the switch to a more
   "intelligent" `Man()` function recently, it means that instead of
   `man lb config`, what was actually run was `man lb config config`,
   which displayed the manpage, then on exiting with `q`, it showed some
   sort of index line todo with a "config" search (no exact manpage
   match?), for which you had to enter `ctrl+c` to get rid of.

this revises things to fix the issues, minimising change by changing
$PROGRAM to "lb COMMAND", with the frontend overriding this.

Gbp-Dch: Ignore

frontend/lb

@@ -15,6 +15,7 @@ set -e
 [ -n "${LIVE_BUILD}" ] && [ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh
 
 # Setting static variables
+PROGRAM="${FRONTEND}"
 DESCRIPTION="Utility to build live systems"
 HELP=""
 USAGE="lb {clean|config|build}"

functions/arguments.sh

@@ -16,7 +16,7 @@ Arguments ()
 
 	local ARGUMENTS
 	local ERR=0
-	ARGUMENTS="$(getopt --shell sh --name ${PROGRAM} --longoptions $LONGOPTS --options $SHORTOPTS -- "${@}")" || ERR=$?
+	ARGUMENTS="$(getopt --shell sh --name "${PROGRAM}" --longoptions $LONGOPTS --options $SHORTOPTS -- "${@}")" || ERR=$?
 
 	if [ $ERR -eq 1 ]; then
 		Echo_error "invalid argument(s)"

functions/common.sh

@@ -10,7 +10,8 @@
 
 
 PROGRAM_NAME="live-build"
-PROGRAM="lb"
+FRONTEND="lb"
+PROGRAM="${FRONTEND} $(basename "${0}")"
 VERSION="$(if [ -e ${LIVE_BUILD}/debian/changelog ]; then sed -e 's/.*(\(.*\)).*/\1/; s/^[0-9]://; q' ${LIVE_BUILD}/debian/changelog; else cat /usr/share/live/build/VERSION; fi)"
 
 LIVE_BUILD_VERSION="${VERSION}"

functions/man.sh

@@ -11,18 +11,8 @@
 
 Man ()
 {
-	local BASENAME
-	BASENAME=$(basename ${0})
-	if command -v man >/dev/null
-	then
-		case $BASENAME in
-			$PROGRAM)
-				man ${PROGRAM}
-				;;
-			*)
-				man ${PROGRAM} $(basename ${0})
-				;;
-		esac
+	if command -v man >/dev/null; then
+		man ${PROGRAM}
 	else
 		Echo_warning "man is not installed, falling back to usage output."
 		Usage

scripts/build/config

@@ -15,7 +15,6 @@ set -e
 [ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh
 
 # Setting static variables
-PROGRAM="lb config"
 DESCRIPTION="Create configuration for live-build(7)"
 USAGE="${PROGRAM}   [--apt apt|apt-get|aptitude]\n\
 \t    [--apt-ftp-proxy URL]\n\