Crash in read_BIN2R() when reading an empty file with forcedVersion

[mcol]

See this example:

zero <- tempfile(pattern = "zero", fileext = ".binx")
write(raw(), zero)

## this is fine
read_BIN2R(zero, verbose = FALSE)
# Error: [read_BIN2R()] BIN/BINX format version (0a) is not supported or file is broken. Supported
#  version numbers are: 03, 04, 05, 06, 07, 08

## this crashes
read_BIN2R(zero, verbose = FALSE, forced.VersionNumber = 8)
# Error in if (temp.RECTYPE != 0 & temp.RECTYPE != 1 & temp.RECTYPE != 128) { : 
#  argument is of length zero

When we force the version number, the code keeps reading the input file for the next few fields, but it never checks whether they are valid, so it eventually crashes.

[RLumSK]

Thanks, this is really an edge case but it makes sense to check this.

[mcol]

Fixed by #226.