Added skillunit_db for efficient execution of skill_unit_timer() (followup to r13503).
Added skillunit_db for efficient execution of skill_unit_timer() (followup to r13503).

git-svn-id: c1e39603916b71782cde5facdf0b79eff05c1414@13504 54d463be-8e91-2dee-dedb-b68131a5f0ec

Nipol/Siesta,Nipol/Siesta,Nipol/Siesta