Fix Printrboard with LCD

[sphereinabox]

The printrbot/printrboard fork of marlin has working LCD support and fixed some some fastio / teensy pin issues not in trunk. This PR includes those changes (commits listed below), but not as a proper merge commit.

I've spent enough time today fucking with finding the commits that fix the problems I was having. Please let me know how to go about making these "real" merge commits or how I can help you merge these (or more?) changes from the printrbot branch.

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The commits fixing the LCD problems I had are listed below:

Commit: 1f17c43 [1f17c43]
Parents: 5d58fe0
Author: Laine Walker-Avina [email protected]
Date: Thursday, April 18, 2013 10:55:16 PM
Commit Date: Saturday, January 18, 2014 2:09:00 PM
Marlin_main: Disable JTAG in setup() if DISABLE_JTAG is defined

Allows use of JTAG pins as IO

Commit: a2b97c3 [a2b97c3]
Parents: cc992f0
Author: Laine Walker-Avina [email protected]
Date: Thursday, July 11, 2013 11:39:12 AM
Commit Date: Sunday, January 19, 2014 3:42:04 PM
Printrboard: Disable JTAG

Commit: ebe5f4b [ebe5f4b]
Parents: a2b97c3
Author: Laine Walker-Avina [email protected]
Date: Wednesday, July 24, 2013 10:20:47 PM
Commit Date: Sunday, January 19, 2014 3:42:04 PM
Fix fan pin from conflicting with other pins on Teensyduino based platforms

Commit: b02e8bd [b02e8bd]
Parents: ebe5f4b
Author: Laine Walker-Avina [email protected]
Date: Wednesday, July 24, 2013 10:25:42 PM
Commit Date: Sunday, January 19, 2014 3:42:04 PM
Fix pins for Printrboard

Commit: cc41b44 [cc41b44]
Parents: 875a39c
Author: Laine Walker-Avina [email protected]
Date: Friday, August 2, 2013 2:37:32 PM
Commit Date: Sunday, January 19, 2014 3:42:04 PM
ultralcd: Use SET_{OUTPUT|INPUT}() instead of pinMode() to set pin direction

[thinkyhead]

Compiler directives should be indented too in this codebase. And things inside of #if blocks also indented. In other words, every block indents, whether compiler or language.

[thinkyhead]

Hey @sphereinabox — sorry for the long delay.

Overall this looks very good. It just needs a spacing tweak, and then it should be rebased against RCBugFix because we use that branch for stuff that will go into the next RC, while the HEAD of RC is meant to match the latest tagged release. If you need any assistance making a new PR please don't hesitate to ask.

The one thing I'm curious about is why the FAN pin needs to be set to output on every write. Is this just a Printrboard thing, or more of an "extra insurance" for all boards?