v0.14.0

This release is a huge step forward for the SingleM software, comprising >750 git commits and several years work (particularly from @AroneyS and @EisenRa and @rzhao-2) since v0.13.2.

There are so many changes that generating a CHANGELOG would take too long.

This release is equivalent to 1.0.0beta8, and is intended as a pre-release for version 1.0.0, but using a standard version number allows for a more streamlined release process.