Bugfixes:

• Avoid failure to describe synonyms under certain conditions.
  ATTENTION: This constitutes a compatibility break: table and schema names now have to be exactly as they are in Oracle's catalogs, i.e. without double quotes and normally in uppercase.
  Per report from Bry Lo.
• Add paths to Makefile so that we can build with Instant Client RPMs.
  Noticed by Andrew Theaker.
• Fix a memory corruption bug that can lead to crashes, errors and wrong results.
• Improve bad performance of SELECT count(*) on foreign tables.
  This is a simple workaround for the (not yet confirmed) Oracle bug 14562530.