Better handling of backup files in paranoid mode

[https://www.google.com/accounts/o8/id?id=AItOawkfHvWdYf7g8kSZA32s7dhK0Xig9JKo_CA]

1. Client removes only one excess backup copy at every configfile change, even if there are more backup copies eligible for deletion. Moreover, lowering the max_copies parameter could cause client to never remove any excess files from there.

2. Space character in backup file names is mildly annoying - datetime.isoformat() will put a 'T' there instead.

3. More robust handling of 'paranoid' attribute values from info.xml (paranoid='True' should also be allowed - currently only paranoid='true' works as expected).

A simple patch (attached) addresses all these issues.

/mkd

[solj]

Patch applied in 1d17b980a15a2fd138ad746d51e148befa26faa0. Thanks!

[Richardheef]

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