tvb_length() --> tvb_reported_length() in several cases + other misc changes.

tvb_length() --> tvb_reported_length() in several cases + other misc changes.

Misc changes:
 - sort entries in an enum by value;
 - add some XXX notes as to possible missing entries in a value-string array;
 - remove an unneeded initializer;
 - 0 --> FALSE for several boolean values;
 - whitespace.

Change-Id: I6c8f1c1f37edad120d979fcd2d7278e7981ca5a7
Reviewed-on: https://code.wireshark.org/review/449
Reviewed-by: Bill Meier <wmeier@newsguy.com>
Tested-by: Bill Meier <wmeier@newsguy.com>