data import usability

[Jack Tanner]

Thanks for making PSPP! I'm trying to load a CSV file into PSPP
0.7.10-g29c145 (Win 8 x64). Two things are tripping me up:

1. File, Import Data, then choose Comma Separated Values as the file type. I
don't know what file mask that applies, but it excludes *.csv.

2. During the import of a CSV, checking "Line above selected line contains
variable names" doesn't populate var names, I still get VAR001, etc.

Also, a suggestion: 

3. File, Import Data should default to All Files as the type, not Text files
(and the latter should be capitalized Text Files for consistency).