sys command from pre-compiled cgx waiting for user input

[martinsaravia]

For the OF-Calculix tutorial flap_perp it happens that if we download the pre-compiled cgx from Calculix page, the binary is precompiled with the flag ALLOW_SYS_FLAG 0; therefore, it requires user input for executing the system commands (this is so to avoid a catastrophe if the fbd file is evil) and therefore the execution of the solid stage is paused indefinitely. I think it could be useful to make clear in the tutorials that to accept the execution of every future 'sys'
command it necessary to add "ALLOW_SYS" in the .cgx file in the $HOME directory.

[MakisH]

This is related to #35. Providing the preconfigured case would work around this issue.

[fsimonis]

To prevent the user from executing potential dangerous 'sys' commands the
program will stop at every 'sys' command and waits for the user to either
accept each single one or to accept the execution of every future 'sys'
command by writing "ALLOW_SYS" in the .cgx file in the $HOME directory.

If this functionallity is not desired then change "ALLOW_SYS_FLAG 0" in the
cgx.h file to "ALLOW_SYS_FLAG 1". The program accepts then all 'sys' commands
w/o warnings.

From the cgx install docs

[MakisH]

@martinsaravia thank you very much for reporting this issue. I added a note in the tutorial pages linking to this issue.