api: fixed unicode problems on get_node, and ensure no cached items are used if cache=false

dependencies: bumped rhodecode-tools to 1.2.1

database: dropped CheckConstraint for auto-increment field for mysql/mariadb compatability. - https://mariadb.com/kb/en/library/constraint/#auto_increment - causes installation error on later MariaDB/MySQL

security: sanitize plaintext renderer with bleach.

dependencies: update rhodecode-tools to 1.2.0

config: updated .ini configs

docs: updated indexer documentation

api: pull-requests, fixed invocation of merge as another user.

api: maked logging of get_repo_file API function tell a bit more info about errors.

api: allow uncached content fetching. - this is mostly to optimize for memory of indexer