fixes to make it all lint

Ran everything through php -l, found out that it didn't compile.

So: fixed the am-I-running-in-Laconica check at the top of each file.
Some syntax fixes in shownotice, showstream, common.

darcs-hash:20080517154701-84dde-8d38da89c5b9cb3b40704adb04a4de880c204181.gz

classes/User.php

@@ -17,7 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('LACONICA')) { exit(1) }
+if (!defined('LACONICA')) { exit(1); }
 /**
  * Table Definition for user
  */