Add additional btree fields for meta pages #40
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and checks for some fields for btree and gin meta pages.
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There are some fields in btree meta page which are not parsed by pg_filedump - btm_last_cleanup_num_delpages, btm_last_cleanup_num_heap_tuples, btm_allequalimage. Their existence varies from postgres version, but for me it looks like a nice addition to overall information about btree index.
Also I thought it to be useful to add checks for version (gin, btree) and magic (btree) of meta pages.