[ABW]: [Fix] removed unused rshares field from hive_posts (it is calculated...

[ABW]: [Fix] removed unused rshares field from hive_posts (it is calculated dynamically in hive_posts_view)
[Fix] more uses for hive_posts_view (needed to make sure all uses of rshares go through view)
[Fix] rshares in hive_posts_view now properly has value 0 when there is no votes
[Fix] there is no such thing as is_invalid in hive_posts (fixed to is_valid)
[Fix] removed some unused class and routines (two whole files and some more)
[Ign] some formatting changes