[Dev] Two small patches.

[Stephen Sinclair]

Hi!

Got a couple of library patches here.

1) I use --prefix a lot when configuring compiled programs, so I
noticed that the configured prefix wasn't being searched properly.
This adds a define to config.h called INSTALL_PREFIX, and adds it to
the paths defined in integra_helper.h.

2) I noticed that you use the word 'class' as a member of various
structures.  This makes it difficult to link against any C++ library,
since it's a reserved word.  The included patch just prepends an
underscore wherever necessary to get the headers to compile with g++.
There might be a better choice of course..

I'll be happy to commit these myself if there's no issues.

Steve
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