Fix footnote number error (Fix tuna#742)

Author: zepinglee

CHANGELOG.md

@@ -24,6 +24,7 @@
 - 修复本科生“使用授权说明”中“日期”后缺失的冒号（[#679](https://github.com/tuna/thuthesis/issues/679)）。
 - 修复 `TikZ` 的 `external` 库与 `pdfpages` 的兼容性问题（[#693](https://github.com/tuna/thuthesis/issues/693)）。
 - 参考文献表中专利文献使用 `address`/`lcoation` 输出专利国别。
+- 修正一章内脚注数量超过 10 个时的报错问题，改为警告（[#742](https://github.com/tuna/thuthesis/issues/742)）。
 
 ### Removed
 

testfiles/09-main.tlg

@@ -768,7 +768,7 @@ Completed box being shipped out [1]
 ....\hbox(12.72305+0.0)x9.53375
 .....\mathon
 .....\hbox(7.90454+1.52669)x9.53375, shifted -4.81851
-......\TU/FandolSong(0)/m/n/9.03375 ②
+......\TU/FandolSong(0)/m/n/9.03375 ①
 ......\kern -0.00017
 ......\kern 0.00017
 .....\mathoff
@@ -2180,7 +2180,7 @@ Completed box being shipped out [1]
 .....\hbox(7.90453+1.52669)x13.55061
 ......\hbox(7.90453+1.52669)x13.55061, glue set 4.51688fil
 .......\hbox(7.90453+1.52669)x9.03374
-........\TU/FandolSong(0)/m/n/9.03374 ②
+........\TU/FandolSong(0)/m/n/9.03374 ①
 ........\kern -0.00017
 ........\kern 0.00017
 .......\glue 0.0 plus 1.0fil minus 1.0fil

thuthesis.dtx

@@ -3268,7 +3268,7 @@
 %    \begin{macrocode}
 \newcommand\thu@circled[1]{%
   \ifnum#1 >10\relax
-    \thu@error{%
+    \thu@warning{%
       Too many footnotes in this page.
       Keep footnote less than 10%
     }%