v2.6

• Have htdecodetoken take advantage of new scitokens-verify ability to read from stdin, when available.
• Add support in htdestroytoken -f for getting a CA cert directory from ${X509_CERT_DIR:-/etc/grid-security/certificates} or from a --capath option, and to get a CA cert file from a --cafile option, mirroring the behavior of htgettoken.