Removing unused FreeSpacePagesCount
We no longer support values for multi trees
Extracting the size of the page out of the page - we need this to be able to reuse page for optimized multi trees
Fixing voron's tests
More explicit helper methods
Refactoring multi tree to a separate file
Moving to page size that is provided once at construction time
Moving to a nested page instead of a single entry for multi trees.
That would allow us to have better space utilization on multi items with small number of values.
Merge branch 'master' into multi

Conflicts:
	Raven.Voron/Voron/ValueReader.cs
Don't affect the position on read
Fixing concurrency exceptions
Avoid corrupting data
Merge branch 'master' into multi

Conflicts:
	Raven.Voron/Voron/ValueReader.cs
database settings changes
Merge branch 'master' of github.com:grisha-kotler/ravendb
Merge branch 'master' of https://github.com/ayende/ravendb
- removed unnecessary form verification script
- fields validation in settings pages, new database, new encryption
sql replication script verification
sql replication fix
Merge branch 'master' of https://github.com/ayende/ravendb