Use install instead of cp in make

Using install instead of cp will make it one-issue simpler for Debian packaging.
Use install instead of cp in make

Using install instead of cp will make it one-issue simpler for Debian packaging.
Create regression-gsl.gsl

regression gsl script
Create regression-case2.xml

regression case 2
Create regression-case1.xml

regression case 1
Merge pull request #18 from suntong001/master

Use install instead of cp in make