Patch provided for intercept to trucate output

[asierllano]

If the output of intercept is a file that already exists, the file was not trucated.
Then if the output length is smaller than previous output, the content is corrupt.

The provided patch truncates the output so the corruption is avoided.

Bear-3.0.21-intercept-trunc.patch

[rizsotto]

Thanks @asierllano , this is merged now. Will be released as 3.1.1.