deleting from history and db by context menu ready
start of workouts db
merged upstream
small commit
Merge pull request #30 from herbatnik/master

Splity działają i są ok + drobne optymalizajce kodu
Merge branch 'n' into nnnn
Merge pull request #31 from herbatnik/deletingRuns

Usuwanie biegów z db.
Merge branch 'n' into nn