Remove Student Name From DB Script

Removes a student's name from the pdropall.sql script.

Changes:

 * db_admin/postgres/pdropall.sql
Remove Site-Specific Comment

Removes a site-specific comment from postgres pgrant.sql script.

Changes:

 * db_admin/postgres/pgrant.sql
Add Script Creating Complex Result Table

Adds a SQL script that creates the complex_perf_result table in
Perftrack databases that don't support it already, such as the
demo data.

Changes:

 * complex_perf_result_update.sql: New file, schema from pcreate.sql.
Fix Broken GUI DB Query

Fixes a query performed by the GUI when saving combined performance
results to the database. This eliminates an error dialog that was
popping up.

Changes:

 * src/GUI/data_access.cpp: Delete broken query and uncomment working
   existing query.
Add New Demo DB Dump

Adds a version of the demo data dump for postgres that works with
the latest version of PerfTrack.

Changes:

 * tests/GUI/GUItest-Instructions.txt: Update instructions to list new
   DB dump file.
 * tests/GUI/postgresql/SC07_milcdemodata_partialCPRs-2013-08-15.dmp:
   New demo data dump created by loading SC07_milcdemodata_partialCPRs.dmp,
   applying the expected_val_update.sql and complex_perf_result.sql
   scripts to the database, and then dumping the result.