Checks that the Bowtie2 progam is found, executable, and returns its version number.
The Bowtie executable can be specified as an environment variable
or with an
bowtie2Program entry in the
checkBowtie2Version does the complete test of findability, executability, and
returns the version number from Bowtie.
getBowtie2Version just returns the currently stored version number.
The version number as a character string, if successful.
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