Version 0.7 of jk_poll

After Ralf Hettinger sent me some change for jk_poll in May I now finally managed to integrate the most oft them. The changes are described in the manual:

- Changes submitted from Ralf Hettinger: 
   - general code cleanup 
   - handle enableFields (start- und endtime, hidden, deleted) using cObj->enablefields) 
   - change use of time() to SIM_EXEC_TIME (makes simulating of times in frontend possible) 
   - change sorting in backend to crdate (as displayed in the frontend) 
   - labels for "no votes" and "one vote" 
   - new options for TypoScript (explained in ext_typoscript_setup.txt and manual): 
	  plugin.tx_jkpoll_pi1.submitbutton_params 
	  plugin.tx_jkpoll_pi1.submit_js_fallback 
	  plugin.tx_jkpoll_pi1.path_to_images 
	  plugin.tx_jkpoll_pi1.show_zero_percent 
   - action hrefs contain all GET parameters 
   - change from GET to POST parameters 
- added first experimental support of Google Chart API to display votes

In addition I included a first experimental support for Google Chart. Perhaps I will do some more work in this area. But this could take a while ;-).