Rename boltbrowser.go to main.go

Also, add version number to about screen

main.go

@@ -12,6 +12,7 @@ import (
 )
 
 var ProgramName = "boltbrowser"
+var VersionNum = 1.1
 
 var databaseFiles []string
 var db *bolt.DB

screen_about.go

@@ -93,6 +93,10 @@ func (screen *AboutScreen) drawScreen(style Style) {
 			yPos++
 		}
 	}
+	yPos++
+	versionString := fmt.Sprintf("Version: %0.1f", VersionNum)
+	termboxUtil.DrawStringAtPoint(versionString, (width-len(versionString))/2, yPos, style.defaultFg, style.defaultBg)
+	yPos++
 
 	commands1 := [...]Command{
 		{"h,←", "close parent"},