patch for the verify* plugins, a new plugin to update modules

[Christian Riggenbach]

hi list

i have written a little addition to the two verification plugins. this two 
patches produces a comment and the correct sha1/md5 sum when a module is 
located in zlocal and has a wrong checksum. they can, after a controll 
question, write it directly with sedit into the DETAILS file. it's handy when 
you just change the version and forget to alter also the sha1/md5 sum or just 
to update the module without wan't to calculate the sums by hand.

additionaly i have created a new plugin to update modules. it's just a simple 
update of VERSION, UPDATED and SOURCE_VFY without the 
multiple-sources-problem solved. a have modified lin to accept 
the -u/--update switch.

i have added it to lin, because this function is to be used with the --want 
switch. it is a POST-BUILD plugin, so  you can be sure that the module 
compiles.

the new plugin is just a suggestion to an update function. i think that 
locating it in lin isn't the right joice, but with this plugin you can lining 
and updating a module in one step ('lin -uw VERSION MODULE').

my editor removes automaticaly all spaces on the end of a line, so the diffs 
contains a bit more than the changes i made.

-- 
with kind regards

Christian Riggenbach
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