Improve notifications

Include memo, show notifications for market proceeds and short proceeds
Merge branch 'develop' of github.com:BitShares/qt_wallet into develop
only notify every 1000 blocks processed instead of every single block
Add and document forcebuildweb target

This target will delete the htdocs folder and then rebuild the
web_wallet. This allows us to easily rebuild the web_wallet even when an
old version is already built.
Merge branch 'develop' of github.com:BitShares/qt_wallet into develop
[BW]: [Fix] CMAKE_COMMAND variable must be enclosed in quotes to satisfy environments where cmake is installed in long path.
Merge branch 'develop' of https://github.com/BitShares/qt_wallet into develop
merge upstream develop