MemcachedTool: revert "Simplify code."

This reverts commit 8e0674d8fd5cd0631ff959fa81f01cd500a74893.

This fixes a regression in test_Member_download_pdf_format (testDmsWithFlare).
Coding style.
Typo in comment.
Improve dosctring a bit.

Hot reindex doesn't synchronise catalogs. It creates a new catalog from
ZODB data, which is expected to reach the same stata as original catalog.
It does not use existing catalog as data source.
Use POST method.

URL length limit is too restrictive to contain all skin selections of a
real site.
another fix OOoParser fixup, span can contain text