[developers] Cheap crashes if VPM file(s) cannot be found

[eric-n at is.naist.jp]

Greetings,

Francis and I noticed that Cheap will reliably crash if it cannot find  
the VPM file(s) referenced in the pet settings.
An example crash follows. The missing VPM is "semi.vpm." I have  
attached a patch that checks for the existence
of VPM files and exits with an error message if they are not found.

eric-n at thyme:~/pet-test [] [17:55:51] [10474]
:) ls
jacy-r376  jacy-r384  japanese.grm  pet  tanaka-006-015.mem  tc-12.txt
eric-n at thyme:~/pet-test [] [17:55:51] [10475]
:) /usr/bin/cheap japanese.grm
reading `pet/japanese.set'... including `pet/mrs.set'... `pet/ 
shared.set'...
loading `japanese.grm' (Jacy (2008-06-23))
reading ME model `tanaka-006-015.mem'... [282757 features]  
Segmentation violation.
Top level.
MT> ^D
eric-n at thyme:~/pet-test [] [17:57:04] [10476]
:)

# after applying patch

eric-n at thyme:~/pet-test [] [18:04:43] [10481]
:) /usr/bin/cheap japanese.grm
reading `pet/japanese.set'... including `pet/mrs.set'... `pet/ 
shared.set'...
loading `japanese.grm' (Jacy (2008-06-27)) reading ME model  
`tanaka-006-015.mem'... [282757 features]
semi.vpm not found
eric-n at thyme:~/pet-test [] [18:04:53] [10482]
:(

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Eric Nichols