arguments in args are now evaluated within args
global options for read
prettified code
global options for write(), improved data conversion to character, export.header is now of type character (insted of factor)
changed conversion from numeric to character
global options for render(), fixed bug in argument "digits"
prettified code, fixes #11
fixed NA treatment in read, prettified code
Merge pull request #13 from SwedishPensionsAgency/global-options

Global options