More tweaks, mostly to SELECT():

More tweaks, mostly to SELECT():

1. When building the select list, insert a separator comma in one
place instead of duplicating the code.

2. Narrowed the scope of fname.

3. Created a new transform_str variable instead of reusing _column
for a different purpose.

4. Juggled _column and _alias a bit so as to eliminate a strdup()
and a free().

5.In searchFieldTransform(): plugged a memory leak in the event of
an error return.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@12103 dcc99617-32d9-48b4-a31d-7c20da2025e4