Sync FSX with FSFS:  Merge revisions
r1627966, r1628093, r1628159, r1631563, r1631567, r1631588, r1631598
and r1634920, resolved the usual conflicts and adapted the code to FSX.

This ports the latest indexing improvements (platform independence,
index checksumming, text markers) to FSX.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1635950 13f79535-47bb-0310-9956-ffa450edef68