add Advanced tab

it is now possible to set some search parameters
in the Advanced tab.
fix listing stations from single data file

- fix the fetching of the stations list when using only one data file
- fix launching a gsimclipar file with a given candidates order
- fix listing the stations ids from a file with no header
add compatibility comment for older sims

older simulated maps had a different name syntax.
fix handling of missing values

it was trying to handle missing values with the insertion of mean
values. it does not work when HD skips a record (e.g., 1996, 1997,
1999).
perhaps it needs a better handling, splitting the detection and filling
of missing data (in f fill_station).
fix estimated space for single data file, fix status

fixed the status group, connected the batch widgets to their status.
reset status counters when finished.
Merge branch 'advanced'

need to re-do parameters settings according to GuiParams
add advanced parameters with GuiParams, deprecated

. small ui adjustments
. new parameters from advanced pane specified with GuiParams and added
to GsimcliPar
. connected both spin boxes of the max search nodes
. deprecated load_gsimcli_settings