Enable FTS engine for sqlite.
Implement local db upgrade.
Upgrade repodb with fts virtual table.
Append to fts table when a package is added.
Speed up icase search by creating the proper index.
Use the same indicies for the local db.
Introduce MATCH_FTS for full-text search.
Add missing break statement.
Merge branch 'pkg-fts'
Append version to fts name.
Fix forced installation.

Issue:	#783
Reported by:	@andrejzverev
Add sandboxed extraction for pubkey signature.
Style fix
Do not call for extra lseek.
Implement fingerprints sandboxing.
Implement fingerprints output parsing.
Remove unused code.
Read string from sandbox till the socket is closed.
Fix issues with adding element to the hash.
Merge branch 'pkg-sig-sandbox'