catalog/pg_collation.h is only available in >= 9.1
Fix and extend description of debian package
When explaining, verify query text

There are some scenarios in which it is possible for multiple calls to the
executor to occur at the same nesting level for the same query. This includes,
at the very least, when SQL functions are called.

As protection against the SQL function case in particular, but also as
insurance against other cases that may emerge, record the SQL text (EXPLAIN...
prefix and all) to be explained within pg_stat_plans_explain, and then verify
that it is consistent with the query descriptor sourceText indicated within
pgsp_ExecutorEnd().
Merge pull request #29 from petergeoghegan/fix_explain

When explaining, verify query text
Merge pull request #28 from petergeoghegan/master

Miscellaneous tweaks.
Merge pull request #26 from terrorobe/patch-2

Fix and extend description of debian package
Merge pull request #25 from terrorobe/patch-1

catalog/pg_collation.h is only available in >= 9.1
Fix oversight in last commit