[PED] Add information in PED column

[antonylebechec]

In order to add information on samples through PED file, use column (>6) to create new column in the samples table.

Suggestion (depend on the strategy):

• control column, by defining them strictly (e.g. column 7 for HPO, column 8 for Tags...)
• add a header on PED file to control field/column name
• autodetect tags in column >6

[antonylebechec]

In STARK, a PED file can contain more column that 6.
A header (first line) define the header, and column name (from 7th column).
If column name is "tags" or "#tags", this is the tags column.
The same can be donne for all type of column (e.g. HPO).

I suggest that if the first line is a comment (start with "#"), this is a header that define column/fields name. And depending on names, a action is done (tags, hpo...) to include value in samples table fields (and create the field if needed)