IDEA-117390 'IntelliJIdeaRulezzz' in Code Completion
HEAD branch filter in new log fixed
IDEA-115906 Throwable ; IDEA-117401 IAE fixed

*update isFresh method for repository;
*hgVersion used for appropriate branchheads file detection;
*tests updated;
*additional checks inserted in HgRepositoryReader for migrating between hg versions
OC-8840