Don't call Load_Config for compare_files
simplified check_device, now: check_reachability
No longer use global attribute {PASS}
Fixed call to unknown method get_password
Fixed recent change 3ac790
Simplified locking (to prevent parallel approves)
con_error is already called by con_wait
con_issue_cmd now adds a linefeed itself.
Simplified printing of banner message
Added comments, fixed error handling
Removed method dev_cor

inverted mask is irrelevant, because we no longer compare semantically.
No longer support fields for file compare.
Fixed revision ba3d2111
Added new parser attribute 'leave_cmd_as_arg'.

This attribute will be used together with "_any".
If set, the command will be left as an argument to be parsed.
Support object-groups for IOS.
Simplified parsing of object-groups

Use new attribute "leave_cmd_as_arg".
Minor cleanup
No longer call drc2.pl
Removed some options from drc3.pl

LOGVERSIONS, NOLOGMESSAGE is default now.
LOGAPPEND isn't supported any longer.
Compare .raw files, if available.