core: add debug functions to measure time spent in code/functions
core: change comment about linker and circular references problems with static libs
Merge pull request #183 from l/translation_ja

core: update Japanese translations
doc: update Japanese auto-generated files
doc: fix example of color codes in command line (user's guide)
tests: add tests of hashtable functions
irc: disable creation of temporary servers by default with command /connect, new option irc.look.temporary_servers
irc: display nick changes in server buffer (closes #188)
core: update ChangeLog
doc: update polish translations
core: update polish translations
aspell: fix compilation with enchant version older than 1.6.0 (closes #192)
trigger: do not allow any changes on a trigger when it is currently running (closes #189)
doc: update Polish auto-generated files
guile: fix compilation with Guile < 2.0.4 (closes #198)
core: fix sentence in ChangeLog
core: update German translations
core: fix compilation of plugin API functions (macros) when compiler optimizations are enabled (closes #200)
core: fix highlight of IRC action messages when option irc.look.nick_mode is set to "action" or "both" (closes #206)
core: update German translations