Irc

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* Added irc.client.PeriodicCommandFixedDelay. Schedule this command
to have a function executed at a specific time and then at periodic
intervals thereafter.

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* Removed `irclib` and `ircbot` legacy modules.

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* Fix file saving using dccreceive.py on Windows. Fixes Sourceforge 6.
* Created NickMask class from nm_to_* functions. Now if a source is
a NickMask, one can access the .nick, .host, and .user attributes.
* Use correct attribute for saved connect args. Fixes Sourceforge 16.

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* Added ServerConnection.reconnect method. Fixes Sourceforge 13.

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* Added missing events. Fixes Sourceforge 12.

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* Moved functionality from irclib module to irc.client module.
* Moved functionality from ircbot module to irc.bot module.
* Retained irclib and ircbot modules for backward-compatibility. These
will be removed in 1.0.
* Renamed project to simply 'irc'.

To support the new module structure, simply replace references to the irclib
module with irc.client and ircbot module with irc.bot. This project will
support that interface through all versions of irc 1.x, so if you've made
these changes, you can safely depend on `irc >= 0.7, <2.0dev`.