<kweblogo> Update ACD and documentation because of image download function.

<kweblogo> Update ChangeLog and README about kweblogo image downloading function.
<kcentroidfold> Add function to download image output file (png format).

Add function to download image output file.

Modify kcentroidfold docs about image downloader.

Modify README about update kcentroidfold.

Add to ChangeLog about 'kcentroidfold'.
Modify miswritten characters in README.
<kweblogo> Change option name for name of output image file.

Modivy source code and ACD file about kweblogo.

Modify kweblogo docs.

Modify README about update kweblogo.

Add to ChangeLog about 'kweblogo'.
<krnafold> Update krnafold documentations.