db_mc_enable, db_mc_isEnabled - new functions to detect whether MC are used

git-svn-id: http://svn.miranda-ng.org/main/trunk@8666 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
fix for toggling MCs on/off

git-svn-id: http://svn.miranda-ng.org/main/trunk@8667 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
disabling metacontacts: fixes

git-svn-id: http://svn.miranda-ng.org/main/trunk@8668 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
typo

git-svn-id: http://svn.miranda-ng.org/main/trunk@8669 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c