More graceful handling of low linewrap values (#1219)

* behavior outline

* enforce positive initial linewrap

Check column widths

update gitignore

throw error when linewrap too small

simply check for large enough linewrap value

* delete unused error message

* PR feedback

make exception more informative

update check_linewrap signature in src and test

make check_linewrap a free function

* delete unused function

* delete else..pass block

* newline for make format

features/format.feature

@@ -323,6 +323,22 @@ Feature: Custom formats
         | basic_folder    |
         | basic_dayone    |
 
+    
+    
+    Scenario Outline: Export fancy with small linewrap
+        Given we use the config "<config>.yaml"
+        And we use the password "test" if prompted
+        When we run "jrnl --config-override linewrap 35 --format fancy -3"
+        Then we should get no error
+        And the output should be 35 columns wide
+        
+        Examples: configs
+        | config          |
+        | basic_onefile   |
+        | basic_encrypted |
+        | basic_folder    |
+        | basic_dayone    |
+
     @todo
     Scenario Outline: Exporting fancy
         # Needs better emoji support