Fix to exclude PNGs with alphatranspareny 

from sharpening to avoid 'noises'.
Add exportValue() function to Fieldtype interface and start implementation on some Fieldtypes.
Merge branch 'patch-2' of git://github.com/horst-n/ProcessWire into pngfix
Merge Horst's PNG alpha channel fix
Fix FieldtypeFloat/InputfieldFloat issue where an undefined precision resulted in assuming precision 0. Instead we now let the precision be defined by the supplied value and how many numbers occur after the decimal point.
Update inputfields.js so that the InputfieldStateToggle class can be removed.
Some text updates to default site profile plus addition of an admin link in the top nav.
A few minor fixes and adjustments including a correction of the way a bitwise status selector was handled by PageFinder in some cases.
Various small fixes/adjustments.
Add removal of pageStack and instanceIDs in Page class to $pages->uncacheAll();
Add an error message to let Superuser know when they need to update their $config->httpHosts setting in /site/config.php
Fix @somatonic issue #378 where certain types of selectors with OR values had remaining selectors get bunched into the OR.
Fix issue #363 where image list toggle icon didn't show if there was only a single image (preventing one from being able to delete the image, if they happened to start in grid mode, for example).
Fix issue #365 where ProcessPageClone delivered a fatal error when trying to clone a page that lacked a 'title' field.
Attempt fix for @teppokoivula issue #367 where change tracking was not reset automatically for multi-language text fields.
Add a language-specific change to the change tracking in LanguagesPageFieldValue per issue #373
Attempt fix/addition for issue #374
Reverse update from commit #374 because it appeared to be causing major side effects.
Add a reloadLanguages method to Languages class per issue #374
Addition of a WireMailInterface and WireMail module base class to allow for 3rd party modules to replace PW's PHP-based mail() sending. Also added a wireMail() function as a replacement for PHP's mail(), but that uses whatever WireMail module is installed.