More robust invocation of bash #787
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Description
Use system method to find correct bash
Motivation and Context
The bash shell executable exists in different places on different systems. Rather than hard coding the path, use an accepted approach to resolve its location (albeit with a different hard coded path). Should resolve #783
Changes
This fixes a bug first identified in #783
Behavior
On some Linux distributions, the current behavior is that the PyNE amalgamation script does not run under CMake because bash is not found.