Merge branch 'master' into novacek/paragraph-section

.gitlab-ci.yml

-image: texlive/texlive
+image: texlive/texlive:latest
 LuaLaTeX:
     script: 
@@ -7,6 +7,11 @@ LuaLaTeX:
         - latexmk -pdflua ctufit-thesis.tex
         - latexmk -pdflua ctufit-thesis-en.tex
         - latexmk -pdflua ctufit-thesis-sk.tex
+    artifacts:
+        paths:
+            - ctufit-thesis.pdf
+            - ctufit-thesis-en.pdf
+            - ctufit-thesis-sk.pdf
 XeLaTeX:
     script: 
@@ -15,6 +20,11 @@ XeLaTeX:
         - latexmk -pdfxe ctufit-thesis.tex
         - latexmk -pdfxe ctufit-thesis-en.tex
         - latexmk -pdfxe ctufit-thesis-sk.tex
+    artifacts:
+        paths:
+            - ctufit-thesis.pdf
+            - ctufit-thesis-en.pdf
+            - ctufit-thesis-sk.pdf
 pdfLaTeX:
     script: 

ctufit-thesis.cls

@@ -446,7 +446,6 @@
   \thm@postskip\thm@preskip
 }
 \def\@endtheorem{\endtrivlist}%\@endpefalse
-\renewcommand\qedsymbol{\textcolor{decoration}{\ensuremath{\blacktriangleleft}}}
 \renewenvironment{proof}[1][\proofname]{\par
   \pushQED{\qed}%
   \normalfont \topsep6\p@\@plus6\p@\relax