maintain gaspar

Add gaspar maintenance to floodam.data

• New functions
  • allert_mattermost to make an alert to Mattermost
  • download_gaspar for the download. Should deal preferentially georisques sources
  • adapt_gaspar for the adaptation → theme + selection of hazards + scope
  • alert_gaspar for the follwing of new events (if no, erases the unuseful archives)
• New schemes, one for each theme
  • scheme_gaspar_azi
  • scheme_gaspar_catnat
  • scheme_gaspar_dicrim
  • scheme_gaspar_pcs
  • scheme_gaspar_pprm
  • scheme_gaspar_pprn
  • scheme_gaspar_pprt
  • scheme_gaspar_risq
  • scheme_gaspar_tim
• New vignette
  • present gaspar database
  • explain how floodam.data is used for the maintenance
• New script → for the automatisation in floodam VM