fix naming of amelia rdata files

get rid of the redundant year, and put  a dot before RData
Merge branch 'master' of https://github.com/jmarca/calvad_rscripts
default maxiter is now 100

300 takes ages, shows not a lot of improvmement.  If it is going to go
past 100, chances are it is sucky data and will go to the full 300,
generating heat only.