build: Set version to 19.0.0 official release

Update version to the v18.2rc1 pre-release

Update version to the v17.2rc1 pre-release

MN: correct port number in masternodeconfig.cpp

doc: Add release notes for 0.18.1.2 release

doc: Add release notes for 0.17.1.2 release

build: update version number

Merge pull request #42 from mdfkbtc/0.18

The Veles Core 0.18.0 "Blockchain Barracuda"

MN: Deprecate activation helper after fix #39

Build: Bump up version number as latest stable release