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Change shell argument in the invocation of subprocess.run, which may lead to no output PDF. (see the document and this question)

Add some new subtle features with version 0.0.7:

1. If it fails to build an output file, both stderr and stdout information are given for debugging. From now, journalist.report returns the return code (0 if successful) of compiling process instead of filename.
2. Turn off beamer argument in journalist.report() if you just want to generate a plain PDF article instead of slides
3. Remove all temp files once after the final report generated successfully.
4. For automatically generated templates, a table or a paragraph may be too long to display in one single slide page, so they are allowed to span multiple pages when specifying template pages for them.

1. use copy instead of ref of a dict in preprocess, to avoid config arg changed in object
2. subplot can show completely