Fixed unconsistent behaviour of read operation in memory database.
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Applied Sylvain's patch to fix issue #1200
OPLA: Function block now can call Java method too
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Merge branch 'master' of https://github.com/nuvolabase/orientdb
Update README.md
Update README.md
Update README.md
Update README.md
Fixed problem with ghost connections
Merge branch 'master' of https://github.com/nuvolabase/orientdb
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Upgraded to BP 2.2.0
Merge branch 'master' of https://github.com/nuvolabase/orientdb
Patch for cases of OConcurrentModificationException on Tree save

This is a patch, we've to discover the real problem why this happens.
Sees that the record is not latest. Saw this some times on running the
Server.
Dropped index if rebuild doesn't succeed.

This is to avoid a database can't be opened anymore because the tree
record structure is damaged.
SQL: minor improved on performance on reading a number that already is a number
Internal: variable parser doesn't return "null" but NULL if the variables doesn't exist
Fixed bug on abstract classes have not sub-classes