Aerofiles

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* IGC/writer: added long_option "RECEIVER" to be compliant with newest spec
* IGC/reader: allow all H-records to be in short or long format
* OpenAir/reader: Added "lineno" to all elements to reference source line

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* fix decode_date bug in igc.reader
* remove python2.6 and python3.3 support

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* fix extensions in IGC file fix record
* remove igc line limit

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* IGC file reader
* Expanded SeeYou reader with task reading

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* OpenAir airspace file reader
* Fixed encoding issues in SeeYou/XCSoar file writers

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* SeeYou CUP file writer
* XCSoar task file writer
* Flarm configuration file writer