More useful number parsing message in error pop-up

[davideby]

When the AbstractParser has an issue parsing a number in a dataset, it prints a useful message in the log and then re-throws the NumberFormatException. However, the thrown exception causes an error pop-up that does not include that useful message.

See

gsea-desktop/src/main/java/edu/mit/broad/genome/parsers/AbstractParser.java

Line 362 in 6908351

} catch (NumberFormatException nfe) {

We should instead throw something like a ParserException with that informative message, wrapping the NFE.