veranderd datamodel

oa: vraag_id as integer
genereren van sql geeft nog een foutmelding maar met ignore, wordt sql
wel gegeneerd.
save cpt also in lookup_answer_label

store country project training questions also in lookup_answer_label.
if we want to use it as normal question (in stead of dimension) we want
the labels etc as well
get/save answer_label_key from environmental variable

lookup_answer_label is also filled in dim_country/project/training
removed database variable add answer_label_key variable
get question_type to better handle answers

if we know question type we don't need to guess the type of the answers
improved fact_answer

* use answer_type to determin type of answer in stead of guessing
* add error reporting
* better field type definition and conversion
* if possible lookup on integer instead of string
* improved layout
moved to correct file location and minor adjustments