| General error handling functions

### ticalcs_error_get

int TICALL ticalcs_error_get(int number, char **message)

Attempt to match the message corresponding to the error number. The returned string must be freed when no longer needed. The error message has the following format: - 1: the error message - 2: the cause(s), explanations on how to fix it - 3: the error returned by the system

number : | error number (see error.h for list).
message : | a newly glib allocated string which contains corresponding error *message.
Return value : | 0 if error has been caught, the error number otherwise (propagation).

### ticalcs_error_free

int TICALL ticalcs_error_free(char *message)

Free the given message string allocated by ticalcs_error_get();

message : | a message previously allocated by ticalcs_error_get()
Return value : | 0 if the argument was valid and the message was freed, nonzero otherwise.

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