[Tools] Fix static analyis issues

This commit addresses issues identified by LGTM for the various
independent (and mostly-independent) files in the Tools subdirectory.
The vast majority of the issues are trivial, and are things like unused
imports or catching BaseException. There was one true bug identified, a
global variable being changed in a function where it was not marked
global, but it only affected output quantity (the variable is named
"VERBOSE"). A couple of other issues identified variables that appear to
represent no-longer-existing options in the code. The options were left,
but a deprecation printout replaces the variable in the event the option
is provided.

src/Tools/wiki2qhelp.py

@@ -165,7 +165,7 @@ def crawl(site=DEFAULTURL):
         if PDFCONVERTOR == 'pisa':
             try:
                 import ho.pisa as pisa
-            except: ("Error: Python-pisa not installed, exiting.")
+            except Exception: ("Error: Python-pisa not installed, exiting.")
             return 1
         else:
             if os.system('htmldoc --version'):
@@ -173,7 +173,7 @@ def crawl(site=DEFAULTURL):
                 return 1
         try:
             from pyPdf import PdfFileReader,PdfFileWriter
-        except:
+        except Exception:
             print ("Error: Python-pypdf not installed, exiting.")
 
     # run ########################################################
@@ -273,7 +273,7 @@ def joinpdf(folder=TMPFOLDER,startpage=INDEX,outputname='freecad.pdf'):
         if exists(p[:-5]):
             if VERBOSE: print ('Appending',p)
             try: inputfile = PdfFileReader(open(folder+os.sep+p[:-5]+'.pdf','rb'))
-            except: print ('Unable to append',p)
+            except Exception: print ('Unable to append',p)
             else:
                 for i in range(inputfile.getNumPages()):
                     result.addPage(inputfile.getPage(i))
@@ -538,7 +538,7 @@ def fetchimage(imagelink):
                 file.close()
                 processed.append(filename)
                 return
-            except:
+            except Exception:
                 failcount += 1
         print ('Error: unable to fetch file ' + filename)
 
@@ -574,7 +574,7 @@ def output(html,page):
     file.close()
 
 def main(arg):
-	global QHELPCOMPILER,QCOLLECTIOMGENERATOR,OUTPUTPATH,PDFOUTPUT,PDFCONVERTOR,TMPFOLDER
+	global QHELPCOMPILER,QCOLLECTIOMGENERATOR,OUTPUTPATH,PDFOUTPUT,PDFCONVERTOR,TMPFOLDER,VERBOSE
 	try:
 		opts, args = getopt.getopt(sys.argv[1:], "hp:t:c:g:o:", ["help", "pdf=", "noremove", "tempfolder=", "helpcompiler-exe=", "out-path=", "helpgenerator-exe="])
 	except getopt.GetoptError: