header-source API mismatch for EN_openOutputFile, EN_openReportFile

[jeffrey-newman]

In epanet3.h, we have these two functions declared:
int EN_openOutputFile(const char* fname, EN_Project p);
int EN_openReportFile(const char* fname, EN_Project p);

These do not seem to be defined, although in epanet3.cpp, we have definitions for:

int EN_openReport(const char* fname, EN_Project p)
{
return project(p)->openReport(fname);
}

int EN_openOutput(const char* fname, EN_Project p)
{
return project(p)->openOutput(fname);
}

[LRossman]

The functions in question in epanet3.h should be named EN_openOutput and EN_openReport. These changes have been pushed onto the dev3 branch for testing.