add code to read/write data in MapQTL format
read.cross.mq: Fix typo (lentgh -> length)
Small change in read.cross.mq: less -> fewer
Update version; add Timothee Flutre to author list in DESCRIPTION
write.cross.mq: slightly more detail in error message
read.cross.mq (mapqtl format): fix two bugs

 - was reordering chromosomes

 - was turning phenotypes into numeric indices and losing actual
   phenotype data
.Rbuildignore: ignore tests/.RData and tests/.Rhistory
Add tests of mapqtl input/output
STATUS.txt: Mention read/write in MapQTL format
Merge branch 'mqmValgrind' of git://github.com/DannyArends/qtl into devel
Merge branch 'mqmValgrind' of git://github.com/DannyArends/qtl into devel
Update version + date
read.cross with format="csv": better treatment of "" values
Update STATUS.txt re read.cross.csv
read.cross.csv: A couple of additional small changes to handle "" fields
Fix bug in read.cross for format="csv" in odd cases

 - if linkage groups not ordered, not given numeric names, and no map
   positions provided, crazy re-ordering would occur.
read.cross.mq: check no. loci vs. number in header
read.cross for doubled haploids in qtlcart format
Merge branch 'devel' of github.com:kbroman/qtl into mqmValgrind