Fix broken submodules

Following e842fdd25fd6c51c511596571f26c6566f83fa29, disposable and
securimage submodules were broken. This restores them to their previous
state.
Remove reference to ERROR_TWITTER_NO_CURL_EXT from language files

Causes SYSTEM NOTICE: 'Use of undefined constant' errors when using a
language other than English.

Follow-up on commit 5c5ee47bd0d853607f30ccefda8614109abda209
Fix system notice in error api
Mantis 2.0 - Database Layer Patch

This patch replaces the ADODB database layer which is known-broken for
non-mysql database e.g. postgres, mssql, oracle in Mantis with a new layer
that:

a) provides supported postgres, mssql and oracle support within Mantis

b) Provides a php memory/performance increase over the existing database
layer for mysql users