conversion of 04 famille in progress

work done at 66%. Problems with handling empty generated dataframe and
concat.
Merge branch 'dev' of https://github.com/openfisca/openfisca into dev
typo in doc
Because of unfound error, started conversion of 04_famille from scratch.

The file has now implemented function to monitor the state of the data frame famille.
Ongoing work on erf import
Merge branch 'dev' of https://github.com/openfisca/openfisca into dev
Correcting bug in 03_fip.py. Continuing translation of 04_famille.

Problem with the column declar1 of data frame famille.
04_famille converted, now with some self-checks
script to transform an individual survey in a by entity survey
transform a table into pytable format
add print_missing option
add a subset option
Merge branch 'dev' of https://github.com/openfisca/openfisca into dev
change a repeated name
Started conversion of 07_invalides.py
change in propagate_to_member

comment so there is no more propagate now.
Change also parameter of the function. Need a name and not a col.
change entity of some data

Les revenus des professions non salariées sont individuel comme sali.
Les pondérations et champm sont ménage.
Change aussi les éléments de l'isf.
Les gains de levée d'option sont aussi individuel
-suppression de f1uv, f1uw et f1ux
create an rsa_act individual

according to legislation for PPE
add avantage_qf

it's interesting to have that output
ppe_coef is a 'foy' variable