plscheme - plscheme: Introduce 1D array conversion routines.

Log Message:
-----------
Introduce 1D array conversion routines. 1D arrays will get converted to vectors
and vectors will get converted to SQL 1D array data type representations by
impostion/exposition functions. (NULL values are supported as well.)

Also, a small but important fix for install.sh script. SCM_DATACONV_FILE path
must point to a file path, not directory. Otherwise, Guile aborts (when tries to
load SCM_DATACONV_FILE) in a very buggy fashion without any informative error
message.

Modified Files:
--------------
    plscheme:
        dataconv.scm (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/dataconv.scm.diff?r1=1.2&r2=1.3)
        install.sh (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/install.sh.diff?r1=1.3&r2=1.4)