Allow for specifying placeholders in shell scripts that are replaced
during build time. Predefine a "@PACKAGE_VERSION@" placeholder that is
replaced with the current version number. Also, rename all shell scripts
to ".sh.in".
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
* Use gettext in "scripts/calcurse-upgrade".
* Add "scripts/calcurse-upgrade" to "po/POTFILES.in".
* Rename "scripts/calcurse-upgrade" to "scripts/calcurse-upgrade.sh" to
make sure xgettext(1) detects the correct input file format.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>