Added multi parameter for page level parameters

[sverma25]

Can be used for setting different parameters for different pages in a document. For example, if wanting to supply table_region for a document, multi can be used to submit different regions for different areas. Common parameters that are to be applied for all pages can still be used.

Multi is used a dictionary to supply additional parameters (Page: Parameters (in dict)). Added parameters override the global arguments for that page

For example,

filename = os.path.join(testdir, "multi_params.pdf")
tables = camelot.read_pdf(filename, pages="all",  
    multi={'2': {"table_regions": ["120, 210, 400, 90"]}}, 
    split_text=True)

In this example, page 1 will use split_text as its parameters, and page 2 will use table regions AND split text as its parameters.

[codecov-io]

Codecov Report

Merging #41 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   87.69%   87.74%   +0.05%     
==========================================
  Files          13       13              
  Lines        1511     1518       +7     
  Branches      349      350       +1     
==========================================
+ Hits         1325     1332       +7     
  Misses        129      129              
  Partials       57       57

Impacted Files	Coverage Δ
camelot/handlers.py	91.01% <100%> (+0.76%)	⬆️
camelot/io.py	100% <100%> (ø)	⬆️

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[sverma25]

@vinayak-mehta Added the multi feature as per your request from camelot to camelot-dev.

[MartinThoma]

Hey!

As camelot is dead, we try to build a maintained fork at pypdf_table_extraction.

Do you want to open the PR against that branch so that we can merge your improvement?