- the Jenkins slave now has the gdb server already started in the background

   nARMED is a Digital OUTPUT. GPIO will be set as input while not
   armed HW will have Pull UP. While armed it will be configured
   as a GPIO OUT set LOW.

   This adds an optional default support for HW that does not
   have and external armed indiction.

Mavlink receiver: Move most variable initializations out of the constructor to the variable declarations

by comparing the configuration options that cmake reports
from the cache with the ones from the current build

cleanup nuttx_, _default targets

Move member variable initialization out of the constructor list to variable declarations, format whitespaces/tabs in sf1xx.cpp.

Before if you were above the maximum altitude you could not command to
go down anymore until the position controller had overshoot to under the
maximum altitude again.

 - fixes Coverity CID 328485

 - fixes Coverity CID 328492

 - fixes Coverity CID 332544

Signed-off-by: CarlOlsson <carlolsson.co@gmail.com>

    - mavlink v2.0 in PX4/Firmware (8f45c4f9ac1391a7519f633ed654cc41c54cafaa): https://github.com/mavlink/c_library_v2/commit/bf68eed6f6819ca1eca44217955794af554d0369
    - mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/f073569b746b6533c1715b0bbfed6c988444b257
    - Changes: https://github.com/mavlink/c_library_v2/compare/bf68eed6f6819ca1eca44217955794af554d0369...f073569b746b6533c1715b0bbfed6c988444b257

    - sitl_gazebo in PX4/Firmware (4e792b24): https://github.com/PX4/sitl_gazebo/commit/b34a96e7e5572209d21b9445be048c77ef041baa
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/2e80474653bcb7808a7dfced4cf403ef607d69da
    - Changes: https://github.com/PX4/sitl_gazebo/compare/b34a96e7e5572209d21b9445be048c77ef041baa...2e80474653bcb7808a7dfced4cf403ef607d69da

    2e80474 2019-02-18 Elia Tarasov - fix comment for mag strength table unit
9a9a137 2019-02-18 Elia Tarasov - fix comment for the file name
7c49b2f 2019-02-18 Elia Tarasov - add units to mag variables
c004d94 2019-02-18 Elia Tarasov - fix magnetic field calculation by using geo lookup table
e9a3940 2019-02-18 Elia Tarasov - fix comment on magnetic data source and properties
c76ac17 2019-02-18 Elia Tarasov - copy magnetic data tables and functions from ecl/geo_lookup
28f59c5 2019-02-18 Elia Tarasov - add constrain function
8c869ed 2019-02-18 Elia Tarasov - fix linker complain on multiple definitions
b5213a7 2019-02-18 Elia Tarasov - add getters for mag inclination and strength
d311233 2019-02-15 Elia Tarasov - fix D-component of magnetic field for Zurich according to WMM2015

Problem description at: http://discuss.px4.io/t/multicopter-lock-if-primary-gyro-fails/9685

- Accel: use cutoff of 62.5 Hz instead of 500 Hz
- Gyro: the cutoff frequency is coupled with the ODR and is fixed to 116 Hz
  at 1 kHz readout rate. So this patch does not change anything for the
  gyro.

Move variable initializations to header file that were no longer in the correct order in the constructor list.