Add a (not-yet-functional) search op drop-down.

Refactor Application_Form_TableRecordEntry to completely restructure the
class.  Add a drop-down menu showing search comparison options for
searches.  [NOTE: Does not yet use the search comparison options for the
search; just does the equality comparison it has always done.  Note 2:
Needs css massaging because search page is ugly.]
Add support for search comparisons beyond =

Closes #6.

Refactor Application_Form_TableRecordEntry to completely restructure the
class (completed in intermediate sub-commit).

Add a drop-down menu showing search comparison options for searches
( <, >, <=, >=, !=, IS NULL, IS NOT NULL, LIKE).  Add a HAS operator
(more usually known as CONTAINS, but HAS fits on drop-down better) that
does LIKE %arg%.  Adjust cascading stylesheets to support drop-down of
search comparator options.
Merge branch with new search functionality