emccalib.tcl: enable search in POSTGUI_HALFILEs

ini hal pins don't exist when [HAL]HALFILEs are executed
but do exist when [HAL]POSTGUI_HALFILES are executed

also: modify example configs/sim/axis/ini_hal_demo.ini
      to demonstrate ability to use calibration for
      ini hal pins

Signed-off-by: Dewey Garrett <dgarrett@panix.com>
Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
docs: fix a typo in the System Requirements document

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
Merge remote-tracking branch 'origin/2.6'

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>