Update JSON files from master branch of masterfiles.
Build JSON files for 3.7 content.
Hashes on right hand side of library elements to avoid double-linkage.
Support level 4 in the left navigation
Experimental - remove base_url
Merge pull request #113 from dmitry84/master

support 4 level in the left navigation and remve base_url
Use a regular expression to try to detect unresolved links.

The naive grep'ing for ][ produces too many false positives from
code blocks using arrays.
Include link to symas.com/mdb for LMDB keyword.
Print warning if unexpanded macros are encountered.
Use search instead of match to find unresolved links.

Warn for unexpanded macros.
If function has no attributes, replace macro with empty line.

Returning an empty list of lines from a macro function indicates
error and leaves the macro unexpanded for diagnostics.
Using function_attributes for functions with no parameters is not
wrong, so allow it by returning a single empty line.
Autocommit: libraries changed 2014-06-17-14:15:23