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Also, removed spurious whitespaces from 743.

Many lines too long.
Use a tab before the keyword type.
Use two tabs before the committer username.

This was not reviewed. No content change.

I added spaces after commas also to be consistent
and to be a little more readable.
This was not reviewed as is minor.

 - ChangeLog updated
 - Current reconfiguration limitations described in User's Guide
 - Dhcp{4,6}ParserTest.reconfigureRemoveSubnet added
 - Subnet::getNextID -> generateNextID
 - Various comments improved