Documents Linux and Windows HLS scripts

The Linux HLS build scripts from
d4197b6f96e4e2d357acfc602ceab0ccd2934828 are documented with
information on setting the $PATH and $XILINXD_LICENSE_FILE environment
variables.

The existing Windows HLS build scripts are documented with information
on setting the $PATH $AUTOESL_HOME and $VIVADO_HLS_HOME environment
variables. The `mabid` user specific directory paths are removed.

Relates to orcc/orcc#120
(hls backend with ram) replace connection.size with connection.safeSize
(hls backend with ram) remove bad comments
(hls backend with ram) Override the method doValidate().
Merge pull request #123 from robstewart57/hls-scripts-pull-request

HLS build scripts pull request
(HLS) Switch to safeSize in getFileContentRead

Adds an additional fix to f2a3be038ca064715fcb75c6a156265a21785aca ,
replacing connOut.size with connOut.safeSize