docs: fix apache as subdirectory instructions. - fix HTTP flag - fix badly stated force_https usage together with proxy-prefix

docs: fixed small wanrings/errors during build.

docs: small improvements on main page.

svn: fixed docs for svn over http.

svn: added svn setup instructions link into the proxy host form.

system-info: use real memory usage based on new psutil api available from 4.0 release. - we show more actual number by calculating physical available memory

system-info: added UUID placeholder for generating platform unique identifiers.

system-info: improve formatting of snapshot info page.

system-info: add edition type into app info.

system-info: unified data structures for usage in API. - most datastructures now use dicts, and consisten return value for human and regular values - added detection of high load average - improved inodes/archive/gist storage limits - fixed problems with references of setting value as human_value and data overrides - re-did search info (more useful for 2 backends that we use)