Nowcasting functions that accept any type of data

[rafalopespx]

To build more cleaverly the package, without problems when calling nowcasting_inla(), create another functions that will by called by nowcasting_inla to make nowcasting without stratifying and make nowcasting with clustering specified data.

Tentative names, nowcasting_no_stratum() and nowcasting_cluster(), add the parameters to call those functions on nowcasting_inla(), these new functions will have a structure similar to nowcasting_age()

• [x] #6
• [ ] #19
• [x] implement above functions on nowcasting_inla()
• [x] test stability of any kind of data passed to nowcasting_inla()

[lsbastos]

I have created a branch to create a stand alone version of nowcasting_inla + nowcasting_age, if that works, I will go for the nowcasting_no_stratum. Wish me luck! I don't want to mess up with git. :-)

[rafalopespx]

• [x] Curly curly notation for DT_SIN_PRI and DT_DIGITA