added getRetros to allow retrospective results to be read also

added getRetros to read in retrospective runs also.
There is also a bug in readVPA2Box looks like a function is calling itself. Its OK if io.VPA1box.R is sourced

stk=readVPA2Box("http://rscloud.iccat.int/kobe/bfte/2012/vpa/reported/med/bfte2012.c1")

[1] "bfte2012.d1"  "bfte2012.p1"  "MINUS0.R"     "bfte2012.e1"  "bfte2012.csv"
[6] "none"        
Read 90 items
Read 316 items
Error in filldimnames(dimnames, iter = iter) : 
  promise already under evaluation: recursive default argument reference or earlier problems?