Add information about default include/exclude filters for scc merge
Addd versionchanged directive
Update version numbers to avoid confusion
Replace scc tools installation method using `pip install scc`
Add paragraphs about usage of SPHINXOPTS to build HTML documentation
Modify doc deployment section to describe scc deploy command
Fix double spaces and other formatting issues raised by @mtbc
Merge pull request #292 from sbesson/rebased/develop/scc_merge_defaults

Add information about default include/exclude filters for scc merge (rebased onto develop)