update version to 1.6-BETA
README: version bump. changelog: module/webui/clientlib. documentation.

- set version to 1.6
- went through git logs for the three module repos, the webui repo and the java-clientlib repo and added an exhaustive list of changes
- updated the documentation describing what you get when you write "dp2 help"
Update changelog with braille stuff
Update fwk changelog
Modfiy system.props to use the data folder for all the stores
Sort and complete the release notes
Set PIPELINE_DATA to %appdata%/daisy-pipeline
Fix the pipeline.bat launcher for parenthesis paths
Set PIPELINE_DATA to %appdata%/DAISY Pipeline 2
Update date and version for v1.6
Fix typo in the Readme