added status area in ui

. status shows current network, decade, station, simulation, and elapsed
time
. also with a progress bar
logic with threads (not running GSIMCLI)

. worker thread to launch gsimcli (with dummy process)
. timer thread to calculated elapsed time
. logic to show/hide widgets related to the status area
refactored param name and added option

. renamed detect_method to correct_method (name could lead to error in
interpretation)
. added new method to correct_method: percentile (same value used in the
comparison/detection)
. small documentation improvement in homog.py
. fixed skewness method, wasn't using user value
. fixed median method, wasn't calculating fixvalues
ui option to percentile correction method, threading work on progress

. added option on correction method combobox
. still trying to implement threads (incomplete)
gui always responsive (not running)

. gui responsive while running gsimcli process
. crashes after that because of timer's QThread out of scope
fixed timer's qthread (workaround'ed), refactoring

. fixed the Timer's QThread issue with a time.sleep(1)
. refactored worker class to the previous name (homogenizing) and
removed the deprecated class version
workaround for NT delay issue

there is an issue while removing files on NT systems, it may delete
before the file is closed when using more than one CPU/core. this
workaround inserts a leap second before the file removal.
allow a different p value for the 'percentile' correction method

instead of forcing the same value as the detection probability.
changes on the detection, launcher, parameters and UI.