fixing VisualStudio errors
Merge branch 'development' of michal@serwer:projects/broom into development

Conflicts:
	src/database/sql_backends/table_definition.hpp
database builder: configuration initialization
TODO updated

configuration system must be reorganized
core: PhotoInfo: reorganizing flags interface
warning fix
database: dumping all photo info's flags
PhotoIterator: using PhotoInfo::Id type
core: PhotoInfo: Id is now struct
SqlBackend: adotping to changes in PhotoInfo
PhotoInfo: removing bool operator

it was causing ambiguity in some situations (int vs bool)
PhotoIteratorTests: adopting tests to changes
warning fix
SqlBackend: updating already stored photos. Saving ID to PhotoInfo
updating TODO
Visual Studio build fix
updating TODO
PhotoInfo: calling update after 'staging area' flag update
updating TODO
gui: PhotosStaging: staging photos on "save" button click