Fix problems in the bibtex files

[bangerth]

@ljhwang ran our database through a script and found a number of problems with the entries. The lines numbers are wrong because I gave her a collated file, but the errors should probably still be fixed:

ignoring entry '2011_11' (line 3272) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2011_38' (line 3550) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2012_6' (line 3895) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2012_11' (line 3945) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2012_12' (line 3957) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2012_29' (line 4134) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2013_65' (line 5283) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2013_66' (line 5295) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2015_88' (line 7919) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2016_113' (line 9793) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2017_46' (line 11267) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2017_50' (line 11309) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2017_69' (line 11512) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2017_89' (line 11717) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2018_3' (line 12081) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2018_4' (line 12093) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2018_27' (line 12349) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry '2018_40' (line 12493) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

ignoring entry 'RMCGG19' (line 13055) because :
	A bibentry of bibtype ‘Article’ has to specify the field: journal

[drwells]

Nice work. Any chance we could add this script to our CI?

[bangerth]

I have no idea how automated this is. @ljhwang?