Remove debug stuff.
Correct fuses.
Define pwm_buffer in pwm_isr.S.

Older AVR-GCC has issues with higher alignments, so define pwm_buffer in
the assembler file.
Fix pwm_isr to work when recursed.
Remove debug LED output.
Whitespaces.
Move PWM initialization to separate function.
New hardware uses PORTD for PWM input.
New hardware has inverters in PWM input.
Clamp PWM input to reasonable range.
Disable verifying programming by default.
Correct input mapping.

Inputs are connected from PD7 down.
Fix stupid bug in PWM input.
Ignore objects and ELF files.
Cleanup PWM code.
Ignore VIM swap files.
Refactor PPM code.
More code cleanup.
Optimize PPM generation.

Instead of reading OCR1A on ever compare match interrupt, reset TCNT1 to
0 when initializing PPM output and generate absolute values for OCR1A.
Ignore hex files.