help, /files is partially working; cases not ok

[alaingdl]

Working on RECALL_COMMAND() #740 and the way of HELP, /Recall is working, I found that HELP,/Files
is not working fine

no output in GDL for :

openr, 11, 'config.h'   ; this file is in the path
help, /files

in gdlhelp.cpp adding the line :

static void help_files(ostream& os, EnvT* e) {
  cout << " maxUserLun : " << maxUserLun << " fileUnits.size() : " << fileUnits.size() << endl;
[...]

I got :
maxUserLun : 99 fileUnits.size() : 128

which is unclear for me, it should start at 2 (-1, 0, 1 are reserved)

another problem is :

GDL> HELP, /FILES, -2, -1, 0, 1, 2

gives no output ...

To be done. (not time now, I am trying to push some other small cleaning ...)

[maynardGK]

In GDL the file units it is concerned with are only those that a /getlun might return, i.e. 100 to (?)128.