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**Installation & Deinstallation Steps**
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[0] You need iRex's Request for Shell Access Package!
More information here: http://wiki.mobileread.com/wiki/Iliad_Software#Shell_Access_Package_.5B1st_must-do-step.5D
http://www.irextechnologies.com/node/45
[1] Copy directory "ipdf_powersave_for_2.9.1" from zip file to MMC/CF/USB/iLiad Main Memory.
[2] Search in Contentlister for the entry "Install ipdf with variable CPU freq."
[3] Click with stylus on it or use up~, down~, & dot-button to start the script.
[4] LED blinks few seconds, screen of iLiad gets an update, 
entry in Contentlister changes to "Restore iRex PDF viewer".
Yamp! The modded ipdf is installed, no reboot is required.
[5] Click on the entry "Restore iRex pdf viewer" to reinstall iRex's pdf viewer.

This script is written for firmware 2.9.1.
Users who start it with another firmware get a error message, which notifies about 
mismatch of target and current running firmware.
This is just for security; no old ipdf gets installed.


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**Needed Steps for an update of script**
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[for a new distribution of script]
change binary files:
* iRex's latest pdf viewer: ipdf_iRex
* modded pdf viewer: ipdf
* change target firmware version in file "Firmware_Script"
for instance "2.9.1" to "2.9.2"

would be cool: some form of crc check, then is it save to use an orig-file of ipdf again.
