External ADC pad support for rssi and power meter

Allowing use of ADC_CHANNEL5 for rssi (rssi_adc_channel) and power meter
(power_adc_channel) on external pad (Rev5 only)
Missed correct number of places power adc comment
Removed unnecessary defaulting to 0

Defaulting to 0 isn't needed as the struct is memset()'d anyway.
Fix MAG_NONE and ACC_NONE cases
Merge pull request #197 from DTFUHF/mag_none_fix

Fix MAG_NONE and ACC_NONE cases
Initial merge of PatrikE's Fixed Wing RTH
Merge pull request #198 from readerror67/fw-nav

Initial merge of PatrikE's Fixed Wing RTH
Renaming fixed wing parameters per cTn's request.
Ooops, removed the extra _FW.
Remove un-used stuff, Keil now has no warnings.
Merge pull request #199 from readerror67/fix-warning

Remove un-used stuff, Keil now has no warnings.
Merge pull request #200 from readerror67/fw-nav-renaming

Preface fixed wing options with fw_
Adding additional servo for flap,
Renaming 'rate' to 'throw' since this influences the percentage of usable servo movement.
presenting fw_rth_alt as a CLI option to make setting easier until configurator changes are made.
Merge pull request #208 from readerror67/fw-rth-update2

Rename pitch/roll rate to 'throw', presenting fw_rth_alt as a CLI option.
Style
Merge pull request #201 from readerror67/flap-fix

Adding additional servo for flap (fix)
Implement auto-reset of spektrum bind flag after power on with bind enabled.
convered line endings
added attributes file