Introduce Java checks.

Introduce program exists check in configure.ac
Create new local macro in ./m4/ to use new java program to check if the required java version is installed.
Execute new macro in configure.ac
Toughened create ditribution tarball script and new release.

Incorporated new upstream release, (v1.0.10), of AlarmClock jar distribution tarball.
Accessories category removed from AlarmClock.Desktop(.in) as it causes a Lintian warning in Bzr builddeb.