global index - work in progress patch

Hi,

I'm implementing "global index" - an index that indexes all tables in an
inheritance hierarchy. For complete feature description, please refer
README.user.

Attached zip contents:
1. README.user: features and limitations from user perspective
2. README.dev: design and implementation notes
3. global_index.sql, global_index.out: regression test and its output
4. tests.txt: concurrency test cases; this and the regression tests should
give an idea of how the feature actually works.
5. gbl_indx_wip1: patch file w.r.t. anoncvs checkout dated 1 Dec 08.

Please do provide any feedback you might have about the implementation, and
ideas regarding limitations/bugs.

Thanks,
Srinath.

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