Split the types and attributes reference doc into two docs

Also moved them up in the index so that the more fundamental material
comes before the more advanced material in the table of contents.
Add more script language reference documentation

Added new sections on operators, statements, and directives.  Also
improved the documentation on types and attributes by providing more
examples and added a chart on the top of each page with links to
each type and attribute for easier access to the information.
Merge remote-tracking branch 'origin/master' into topic/dnthayer/langref
New page for List of Log files, linked to script-reference
Changing name of file
More updates to log files page: descriptions
Adding deatils for modbus_register_change.log
Broke down logs into grouped sections based on use & origin
Add a test that detects changes in the list of all Bro log files
Added missing log files prof, stderr, stdout
Improved the log file reference documentation

Reorganized the log file reference documentation, improved some of the
descriptions, and corrected a typo in a log filename.  Also removed
non-ascii characters that somehow got in the text.
Minor improvements to script language reference docs
Merge remote-tracking branch 'origin/master' into topic/dnthayer/langref
Merge remote-tracking branch 'origin/topic/dnthayer/langref'

* origin/topic/dnthayer/langref:
  Minor improvements to script language reference docs
  Add more script language reference documentation
  Split the types and attributes reference doc into two docs

Wow, this is great!

BIT-1269 #merged
Merge remote-tracking branch 'origin/topic/jdopheid/BIT-1242'

* origin/topic/jdopheid/BIT-1242:
  Improved the log file reference documentation
  Added missing log files prof, stderr, stdout
  Add a test that detects changes in the list of all Bro log files
  Broke down logs into grouped sections based on use & origin
  Adding deatils for modbus_register_change.log
  More updates to log files page: descriptions
  Changing name of file
  New page for List of Log files, linked to script-reference

Very nice. I've reorganized slightly more, mostly to shrink down the
"other" category: moved some of that into "Detection" and "Files" (the
latter is small, but will hopefully grow).

BIT-1242 #merged
Updating plugin documentation.

Extending debugging section a bit, and claryyhing why some content is
missing. Also linking into new development section at top-level.
Fix for allowing a packet source plugin to provide multiple prefixes
with a colon.
Switching the prefix separator for packet source/dumper plugins once
more, now to "::".

Addresses BIT-1267.
Include plugin unit tests into the top-level btest configuration.

Turns out they weren't part of it yet. Comes with some baseline updates.
Fix for test portability.