hpc (devel) - unhelpful error message when missing packages

[M.P. Barzine]

if you have missing package and try:

hpc=import('ebits/hpc')

the error is unhelpful as it won't list the name of the missing packages

Error in if (any(.pkg_missing)) stop("The following packages need to be installed: ",  :
  missing value where TRUE/FALSE needed
In addition: Warning message:
In any(.pkg_missing) : coercing argument of type 'character' to logical

[Michael Schubert]

note that his was on missing rzmq library

[M.P. Barzine]

Okay. Correction also in barzine-patch-1

[Michael Schubert]

fixed in #76