Added test data for hash-like header metadata

t/data/strepo/release/rc.stm

 Description: Basic release criterion
 Owner: some.guy@example.com
 Various ISTQB BS: this; that...
+Cartesian: proto=imap; proto=pop3; os=w7a; os=wxx; os=wva; os=w8x; arch=amd64; arch=x86
 
 This is the release client protocol.  Here the body starts...
 
 2. Check IMAPIsm        {proto==imap}
 2. Check POP3ism        {proto==pop3}
     > result is OK
+3. Some XP thing        {os==wxx}
+3. Some Win7 thing      {os=~w7*}
+4. Some amd64 thing     {arch=amd64}